{"id":40727,"date":"2023-10-04T13:27:25","date_gmt":"2023-10-04T17:27:25","guid":{"rendered":"https:\/\/mjtsai.com\/blog\/?p=40727"},"modified":"2023-10-09T09:13:35","modified_gmt":"2023-10-09T13:13:35","slug":"control-center-in-macos-always-using-cpu","status":"publish","type":"post","link":"https:\/\/mjtsai.com\/blog\/2023\/10\/04\/control-center-in-macos-always-using-cpu\/","title":{"rendered":"Control Center in macOS Always Using CPU"},"content":{"rendered":"

Frank A. Krueger<\/a> (Hacker News<\/a>):<\/p>\n

The Control Center icon in the Mac [menu bar] is always running and always using 1% CPU. Not a big deal, but I finally had to know wtf it was doing…<\/p>

Turns out it is constantly re-rendering its SwiftUI (running layout) even though there is no UI visible. 🤣 Yay for modern software<\/p><\/blockquote>\n\n

Frank A. Krueger<\/a>:<\/p>\n

In a nutshell, no, this is not increasing my power usage by 1%.<\/p>

[…]<\/p>

One app doing that isn’t a biggie, sure, but it should be fixed anyway. If every background app started doing this, we’d end up with lots of wasted CPU cycles. Plus: on weaker machines that process may take up more than 1% and could actually prevent the CPU from fully throttling.<\/p><\/blockquote>\n\n

Harmonicritik<\/a>:<\/p>\n

\n

Functional-reactivity is power-efficient because the view chooses when to ask its components for updated data. SwiftUI was invented for the Apple Watch following this principle.<\/p>\n<\/blockquote>\n\n

However, it doesn’t work that way in practice, seemingly because<\/a> AppKit is repeatedly asking SwiftUI for information that it hasn’t cached.<\/p>\n\n

Marcin Krzyzanowski<\/a>:<\/p>\n

🤔 SwiftUI on macOS underperforming is an understatement. “tell me you rewrite user-facing parts of the operating system interface with new technology without checking if that’s the right tool for the job”<\/p><\/blockquote>\n\n

dosdude1<\/a>:<\/p>\n

\n

Yep, I notice this in EVERY app based on SwiftUI, especially under Mac OS.<\/p>\n<\/blockquote>\n\n

Control Center in macOS is just poorly implemented in general. Lots of little glitches, awkward modes and navigation, and it doesn’t support keyboard navigation.<\/p>\n\n

Previously:<\/p>\n